Title :
Design issues in decision feedback MMSE multiuser receivers for high data rate indoor wireless CDMA networks
Author :
Smee, John E. ; Schwartz, Stuart C.
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ, USA
Abstract :
We consider multiple-access interference (MAI) and intersymbol interference (ISI) suppressing receivers for asynchronous direct-sequence spread-spectrum (DS/SS) code-division multiple-access (CDMA) networks operating over wireless multipath channels with background Gaussian noise. By varying the degree of connectivity in the feedforward filter (FFF), which linearly processes the samples at the output of a chip-matched filter, and feedback filter (FBF), which linearly processes previous decisions, we define a group of decision feedback (DF) minimum-mean-square-error (MMSE) receivers. A performance evaluation for coherent binary 10 Mb/s transmission with processing gains from 7-10 elucidates some of the performance/complexity tradeoffs present in the combined suppression of MAI, ISI, and noise
Keywords :
Gaussian noise; code division multiple access; feedback; feedforward; filtering theory; indoor radio; interference suppression; intersymbol interference; least mean squares methods; matched filters; multipath channels; packet radio networks; receivers; signal processing; spread spectrum communication; 10 Mbit/s; asynchronous DS/SS; background Gaussian noise; chip-matched filter; code-division multiple-access; coherent binary transmission; decision feedback MMSE multiuser receivers; direct-sequence spread-spectrum; feedback filter; feedforward filter connectivity; high data rate; indoor wireless CDMA networks; intersymbol interference suppressing receivers; minimum-mean-square-error; noise suppression; performance evaluation; performance/complexity tradeoffs; processing gains; wireless multipath channels; Field-flow fractionation; Filters; Gaussian noise; Interference suppression; Intersymbol interference; Multiaccess communication; Multipath channels; Multiple access interference; Output feedback; Spread spectrum communication;
Conference_Titel :
Universal Personal Communications Record, 1997. Conference Record., 1997 IEEE 6th International Conference on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3777-8
DOI :
10.1109/ICUPC.1997.625464
